Malicious PDF — malware analysis report

Static analysis result for SHA-256 97bb84c62cb4bb3f…

MALICIOUS

PDF

86.2 KB Created: 2021-07-17 12:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 62d9876129c368a5425a3967adc942df SHA-1: b06cb80b57a26d0f168c47c9e994cddda2185005 SHA-256: 97bb84c62cb4bb3f87432bfb515bae7cb0c1ab66b65563bbea6455c657b9babd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, indicating an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics strongly suggest a malicious intent to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/dfb7f293e296f286ec090e27ae03819f/87599769928.pdf In PDF document text
    • http://chataphan.com/file_media/file_image/file/28505444756.pdfIn PDF document text
    • https://emmaushuis.org/pages/8534638729.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d08f3be75---muvixonizabotozutebozeve.pdfIn PDF document text
    • https://kildevangen.dk/files/39593229484.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/pufadokagile.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/faa160f677af3f3df9850cb9f9c68e70/zamefetivowizu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/ec11ea00566d03fb483433f92c6c479b/22384117604.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d345861b0---93690312631.pdfIn PDF document text
    • https://mnlex.it/file/30187316228.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/50893824617.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fozanevoxiximafedidikari.pdfIn PDF document text
    • http://standrewsparishhighschoolclassof1964.com/clients/70428/File/mokopexarikijok.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/japituwuwuweronu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084220f97424---baxogojo.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608cda045a31a---77465215772.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/5a54b2a66d02cf8fdfe79c076a465692/woxisozuwidinixasiti.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-29/20210629204606863275.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc1f4f077f---77940118206.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/jabivejixataw.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/zadaribolazijivedumetub.pdfIn PDF document text
    • https://svingenieria.cl/userfiles/file/roxuvafelaxifixuzikilag.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/309556a3cdc4ead06e4c1d8e9c3f53ea/88980305756.pdfIn PDF document text
    • https://insidemanila.ph/article/1479/central-luzons-economy-surpasses-naIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=province+of+central+luzonPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 18440 bytes
SHA-256: 67ac1944720aef1e918d6c35324dfdc5b9c3071123be652fff321628e7fc78a6
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13422 10388 bytes
SHA-256: 1dcaa2bac91bc0833fcdfcfbc7ca632126d9c953f6bbd21d2dc909630161e33c